<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <div class="active test">标本</div>
    
    <div v-bind:class="[one, two, 'three']">内容</div>

    <button @click="one=''">修改</button>
  </div>
  <script src="./vue.js"></script>
  <script>
    new Vue({
      el: '#app',
      data: {
        one: 'active',
        two: 'test',
        three: 'haha'
      }
    })
  </script>
</body>
</html>